Class 12th Physics Chapter 5 Magnetism & Matter VVI Objective Question
Magnetism And Matter
1. SI unit of magnetic flux is :
(A) Ohm
(B) Weber
(C) Tesla
(D) None of these
| Answer:- B |
2. Copper is
(A) Paramagnetic
(B) Ferromagnetic
(C) Diamagnetic
(D) Semi-conductor
| Answer:- C |
3. Which of the following has greater susceptibility ?
(A) Paramagnetic
(B) Diamagnetic
(C) Ferromagnetic
(D) Semi-conductor
| Answer:- A |
4. If a magnet is kept in magnetic meridian with its North pole pointing north, then number of neutral points will be :
(A) 1
(B) 2
(C) 3
(D) None of these
| Answer:- B |
5. Which is more appropriate material for a strong electromagnet?
(A) air
(B) soft iron
(C) steel
(D) alloy of copper and nickel
| Answer:- B |
6. Liquid and gases are
(A) ferromagnetic
(B) diamagnetic
(C) paramagnetic
(D) behave magnetically like a vacuum
| Answer:- A |
7. Which of the following materials has magnetic susceptibility negative and less than 1 in value ?
(A) ferromagnetic
(B) paramagnetic
(C) diamagnetic
(D) None of these
| Answer:- C |
8. The magnetic susceptibility of paramagnetic substances is
(A) constant
(B) zero
(C) infinity
(D) dependent upon magnetic field
| Answer:- A |
9. Nickel is
(A) diamagnetic
(B) paramagnetic
(C) ferromagnetic
(D) None of these
| Answer:- B |
10. The distance between the two poles of a magnet is called
(A) magnetic length
(B) magnetic field
(C) magnetic axis
(D) magnetic moment
| Answer:- A |
11. A magnet needle placed in a non-uniform magnetic field can experience
(A) a force and a torque
(B) a force but not a torque
(C) a torque but not a force
(D) None of these
| Answer:- A |
12. The source of magnetism of a magnet is
(A) spin of electron
(B) cosmic rays
(C) presence of a big magnet inside the Earth
(D) the earth
| Answer:- A |
13. Which should be small for a permanent magnet ?
(A) retentivity
(B) coercivity
(C) both (A) and (B)
(D) None of these
| Answer:- D |
14. Iron is ferromagnetic
(A) at all temperature
(B) at NTP only
(C) above 770°C
(D) below 770°C
| Answer:- D |
15. The magnetic susceptibility of air is
(A) positive
(B) negative
(C) zero
(D) positive or negative
| Answer:- C |
16. Which of the following is diamagnetic?
(A) Na
(B) Ca
(C) O2(STP)
(D) N2(STP)
| Answer:- D |
17. The magnetic induction at a distance r from a single pole is inversely proportional to
(A) r
(B) r2
(C) 1 / r
(D) 1 / r2
| Answer:- B |
18. The work done in rotating a bar magnet of magnetic moment M in a magnetic field B by an angle θ from stable equilibrium is
(A) MB sinθ
(B) MB cosθ
(C) MB (1 – cosθ)
(D) MB (1 – sinθ)
| Answer:- C |
19. The unit of magnetic potential is
(A) J Am
(B) JA-1m-1
(C) JA-1m-2
(D) JA–2m-2
| Answer:- B |
20. The value of permeability of a vaccum is
(A) 4π x 10-7 henry/meter
(B) 4π x 10-9 henry/meter
(C) 4π x 10-7 henry/meter
(D) 4π x 107 henry/meter
| Answer:- A |
21. The value of dip at the pole of the earth is
(A) 0°
(B) 90°
(C) 45°
(D) 180°
| Answer:- B |
22. A freely suspended needle at equator of the Earth
(A) remains vertical
(B) is inclined at 45°
(C) remains horizontal
(D) is inclined at 60°
| Answer:- C |
23. For making an electromagnet, core material should have
(A) high magnetic susceptibility
(B) high magnetic retentivity
(C) high hysteris area
(D) None of these
| Answer:- A |
24. A bar magnet of magnetic moment M is cut into two parts of equal length. The magnetic moment of either part is
(A) M
(B) M/2
(C) 2M
(D) Zero
| Answer:- B |
25. Magnetic dipole moment is a vector quantity directed from: .
(A) South to North Pole
(B) North to South Pole
(C) East to West direction
(D) West to East direction
| Answer:- A |
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